Apparatus for hardening rotary cutters.



No. 698,12l. Patented Apr. 22,1902."

H. HEBERT.

APPARATUS FOR HARDENING ROTARY GUTTERS. (Applicaton filed Jan. 18, 1902.) 4 (Ne Model.) 2 Sheets-She I.

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No. 698,|2|. Patented Apr. 22, |902'. .v H. LIEBERT.

APPARATUS FOR HABDENING ROTARY GUTTERS.

(A'D'nlcation lecl- Tam 18, 1902.) l (No Model.) 2 Sheets- Sheet 2.

Fig@ A TMR/VE VS Y onto which the bottom disk cis secured.

UNITEDl STATES PATENT HENRY LIEBERT, OF MILNROVV, ENGLAND.

APPARATUS FOR HARDENI NG RoTARYcuTTERs.

SPECIFICATION' forming,` part of Letters :Patent No. 698,121, dated April 22, `1902.

Application filed January 18,

1902. sereine. 90,308. (roman.)

T0 (all whom, it may concern:

Be it known that l, HENRY LInnER'r, a subject of the King of ,Great Britain, and a resident of Milnrow, in the county of Lancaster, England, (whose post-oilice address is Perseverance Works, Milnro'w, aforesaid,) have invented new and useful Improvements in Apparatus for IIardening Rotary Cutters, (for which I have made application for a patent in Great Britain, No. 6,978, dated April 3, 1901,) of which the following is a specification.

My invention relates to improvements in apparatus for hardening rotary cutters, such as thin milling-cutters, circular knives, or saws; and the object is to provide means whereby in the process of hardening such cutters are prevented from warping, twisting, or fracturing, he teeth or cutting edge of the cutter being only hardened by allowing the liquid used for hardening to have access to the said teeth or cutting edge only. I attain this object by the mechanism illustrated in the accompanying two sheets of drawings, in which- Figure lis a vertical section, partly in view, ofa hardening apparatus consti-noted in accoi-dance with my inventioncomplete. Figs. 2 and 4 are side views of details; Fig. 3, a plan of Fig. 2, and Fig. a plan of Fig. 1.

Similar letters refer to similar parts throughout the various views.

In carrying out my invention and referring to the figures generally I place the cutter a to be hardened between two disks b c, employed in a slightly-conical vessel il, adapted to be rotated with the said disks and cutter in a second but stationary vessel e, the top of which has a rim j', rcaching'over the top into the inner vessel d. 'lhe inner vessel (L and disks are mounted upon the upper end of a vertical shaft g and jointly rotated therewith, for instance, in the following manner: The bottom h ci' the vessel d is'formed with an inwardly-projecting boss t', whereby the said vessel is secured to the'top of the shaft This boss is formed with a shoulder k, The shaft y is mounted inthe bearings l and fm, the former being formed with a stulling-'lyox on the bottom a of the second vessel c. In

` order to facilitate the placing of the cutter to be hardened between and the removing of the same from the said two disks, I provide a spindle 0 (see more particularly Figs. l and' 4) in or about the middle furnished with a boss t, having externallya flat spring 1J (or springs) secured, adapted to-engage in the bore of the cutter, and thus hold same in positionthereon. The upper end of this spindle servesas a handle q, while-the lower end enters a socket lr, formed in the shaft f which carries and rotates the said disks and inner vessel, while the upper disk b is formed ,with a hole s, corresponding in diameter exterior diameter of the boss t, so as to allow of placing the said upper disk concentrically upon the cutter a and the said lower disk c. The said disks are diameter than the cutter to be hardened that the teeth oreutting edge of the latter only are exposed and project therefrom. to prevent the cutter to be hardened being chilled by the cold surfaces of the said disks and also to prevent the liquid used for hardening when rushing against the teeth or cutting edge splashing againstthe cutter body, the said surfaces are furnished with asbestos or the like non-combustible, non-heat-conducting, or refractory material fa, employed in annular grooves fu, formed in the same;

The interior diameter of the inner vessel d and the diameter of the rotary cutter c are such as to leave an annular space 'w' between the same, while in the bottom h of the said inner vessel radial buckets a: are formed, which ycommunicate with the second vessel e. The said second vessel serves for the reception of the liquid necessary for hardeningsay oil,water, ormercury-and is furnished with overflows y, whereby the quantity of liquid used can be kept uniform. The said overfiows may communicate with a third vessel or trough z, formed around the second-vessel c, `adapted to receive the superfluous liquid, or the latter may be run od in any other suitable manner. The suction created by the rotation of the inner vessel d causes the liquid used for hardening to be raised from the second vessel e and be continuously circulated through the'annular space w between the interior of the inner vessel d and periphery of the disks b' c, the centrifugal force keeping the liquid always against the interior with the so much lessin In order of the inner vessel d. stant How of fresh cold the teeth or By this means a eon liquid is rushed past substantially forth.

2. In an apparatnsforhardeningrotary eutters, a vertically-mounted shaft, avessei and 3o two cutter-holding disks on the same, a see- 0nd vessel surrounding the Irst-na1ned vessel, buckets in the bottoni forth.

3. In an apparatus for hardening rotary eutters, a vertieailymlounted shaft, a vessel and two eutter-ho1dingdisks outhe saine, van au nular space between the interior oi' the said vessel and the peripheries of the said disks, a removable spindle iu the said shaft carrying the cutter to be hardened and means f 'or r0- disks supporting and the upper one resting; upon the said cutter, all Combined substantially as and for the purpeseset forth. l

In witness whereof I have hereunto set my hand in presence of two .vitnesses.

II. LIEBEI-'i. Witnesses:

ALFRED Bossnnnu'r, STANLEY E. lla/mmm... 

